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HYDROLOGIC OUTLOOK
MTC003-009-037-067-095-097-107-111-WYC033-062130-

HYDROLOGIC OUTLOOK
NATIONAL WEATHER SERVICE BILLINGS MT
320 PM MDT WED MAY 4 2016

WATER LEVELS ARE INCREASING ON AREA STREAMS AND RIVERS THIS
AFTERNOON AS RUNOFF IS WORKING DOWNHILL FROM MOUNTAIN SNOW MELT.
FORECASTS CONTINUE TO SHOW SIGNIFICANTLY HIGHER WATER LEVELS ON
AREA WATERWAYS BY THIS WEEKEND...WITH FLOWS RANGING FROM 3 TO 5
TIMES CURRENT LEVELS. MORE SEASONAL TEMPERATURES DEVELOPING THIS
WEEKEND WILL HELP SLOW SNOW MELT AND MODERATE RIVER LEVELS SOME BY
EARLY NEXT WEEK.

FOR THOSE PLANNING RECREATION ON AREA WATERWAYS THIS WEEKEND BE
PREPARED FOR CHANGING CONDITIONS AND SIGNIFICANTLY HIGHER FLOWS.
THERE MAY BE HIDDEN HAZARDS AND FLOATING DEBRIS MAKING WATER
RELATED ACTIVITIES DANGEROUS AT TIMES.

$$

HYDROLOGIC OUTLOOK
WYC013-060801-

HYDROLOGIC OUTLOOK
NATIONAL WEATHER SERVICE RIVERTON WY
201 PM MDT WED MAY 4 2016

...RAPID RISES IN SMALL STREAMS AND CREEKS POSSIBLE OVER THE WIND RIVER BASIN
SATURDAY AFTERNOON THROUGH MONDAY MORNING...

RAINFALL WILL START ACROSS THE WIND RIVER BASIN BY FRIDAY AFTERNOON AND INCREASE
IN INTENSITY BY SATURDAY AFTERNOON.  RAINFALL, HEAVY AT TIMES, WILL CONTINUE
THROUGH SUNDAY MORNING. TOTAL RAINFALL AMOUNTS THROUGH SUNDAY NIGHT ARE FORECASTED
TO BE 2 AND A HALF TO 3 INCHES WITH ISOLATED AREAS IN THE MOUNTAINS AT 3 AND A
HALF TO 4 INCHES.

SNOW LEVELS WITH THIS EVENT WILL START OUT AT 9500 FEET FRIDAY AFTERNOON THROUGH
SATURDAY AFTERNOON; DROPPING TO 8000 FEET BY SUNDAY NIGHT.

THE FIRST ACTIVE SNOWMELT CYCLE OVER THE MOUNTAIN STREAMS AND CREEKS ALONG THE
WIND RIVER BASIN BEGAN TUESDAY AFTERNOON.  ACTIVE SNOWMELT RUNOFF WILL CONTINUE
THROUGH FRIDAY AFTERNOON AND TAPER OFF BY SATURDAY.  RAINFALL RUNOFF AND
SNOWMELT RUNOFF WILL COMBINE FORCES SATURDAY AFTERNOON TO CAUSE RAPID RISES
ALONG SMALL STREAMS AND CREEKS ALONG THE LOWER ELEVATIONS OF THE WIND RIVER BASIN.
SMALL STREAM AND CREEKS ARE EXPECTED TO RUN AT HIGH LEVELS THROUGH MONDAY MORNING.

THE LITTLE WIND RIVER NEAR RIVERTON IS EXPECTED TO RISE STEADILY AND EXPECTED TO
CREST NEAR FLOOD STAGE BY LATE MONDAY NIGHT.  THE WIND RIVER IS EXPECTED TO CREST
BELOW FLOOD STAGE BY LATE MONDAY NIGHT THROUGH EARLY TUESDAY MORNING.

STAY TUNED FOR UPDATED FORECASTS, WATCHES, AND POSSIBLE WARNINGS WITH THIS
EVENT. REMEMBER, WITH ACTIVE SNOWMELT RUNOFF, STREAMS AND CREEKS WILL BE HIGHEST
DURING THE LATE AFTERNOON AND EARLY MORNING HOURS. AVOID ANY TYPE OF STREAM
CROSSINGS DURING THOSE TIMES.

GRAPHICAL FORECASTS ARE AVAILABLE AT:
HTTP://WATER.WEATHER.GOV/AHPS2/INDEX.PHP?WFO=RIW
VISIT WEATHER.GOV/RIVERTON AND SELECT THE RIVERS & LAKES TAB FOR
GRAPHICAL FORECASTS AND ADDITIONAL INFORMATION.

$$
JTFAHEY

U.S. Dept. of Commerce
NOAA National Weather Service
1325 East West Highway
Silver Spring, MD 20910
E-mail: w-nws.webmaster@noaa.gov
Page last modified: June 2, 2009
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